This script will act as a sort of barrier to prevent people from right clicking on your forum thus offering some sort of protection. There are ways to get round this but think of it as a hurdle which may put some people off.

While this blocks the ability to Right Click, it also blocks the ability to copy and paste through the context menu that appears when Right Clicking. Copy and paste functionality is still available through the Ctrl+C and Ctrl+V shortcuts respectively.

Editing the Error Message:
Changing the message shown is a piece of cake. This can be done by finding this line near the top of the script:

May seem like a stupid question but this "hook" your talking about how does one go about doing that? I know how to create the template but the hook is something I am not familiar with. Will be glad to read some if I need to learn.